Operator`s manual

Signametrics 116
3. Select the 4WΩ function on the SM2040, Autorange. Set the calibrator to 0 Ω. Be certain that the calibrator is
set to external sense ("EX SNS" on the Fluke 5700A or “4-Wire Comp” on the 5520A). Allow the SM2040 to
settle for a few seconds, and perform the Relative function.
4. Apply the following Resistance values to the V, Ω + & - terminals. Check to see that the displayed reading on
the SM2040 is within the indicated range.
Table 9-4 Resistance Test, 4-wire
Step Range Input Minimum Reading Maximum Reading
1
33 Ω [1] 0 Ω -2 mΩ 2 mΩ
1
33 Ω [1] 10 Ω 9.9972 Ω 10.0028 Ω
1
330 Ω 0 Ω -6 mΩ 6 mΩ
2
330 Ω 100 Ω 99.987 Ω 100.013 Ω
3
3.3 kΩ 0 Ω -33 mΩ 33 mΩ
4
3.3 kΩ 1 kΩ 0.999917 kΩ 1.000083 kΩ
5
33 kΩ 0 Ω -350 mΩ 350 mΩ
5
33 kΩ 10 kΩ 9.99905 kΩ 10.00095 kΩ
5
330 kΩ 0 Ω -5 Ω 5 Ω
6
330 kΩ 100 kΩ 99.986 kΩ 100.014 kΩ
[1] SM2044 only.
Note: The use of 4-wire Ohms for resistance values above 300 kΩ is not recommended.
6.5 AC Voltage Test
The following procedure may be used to verify the accuracy of the ACV function:
1. If you have not done so, install the SM2040 and place the covers back on to the computer. Ensure that the
computer has been on for at least one-half hour, with the covers on, before conducting this test.
2. Apply the following AC voltages to the V, Ω + & - terminals. Check to see that the displayed reading on the
SMX2040 is within the indicated readings range.